超静定结构位移计算

CALCULATION OF DISPLACEMENT FOR STATICALLY INDETERMINATE STRUCTURE

超静定结构位移计算通常是将其转化成静定结构进行分析．位移计算公式中含有结构中产生的内力项．论述了结构只承受温度改变作用或支座移动作用时，直接对超静定结构进行分析的情况，所得位移计算公式中不含有结构中产生的内力，在形式上与静定结构时完全一样．表明，超静定结构承受温度作用或支座移动作用时，结构的位移仅仅依赖于温度作用的分布情况或支座移动状况，与其产生的内力无关．本文还对超静定结构刚刚达到极限荷载状态时的位移计算进行了论述．

Usually the calculation of displacement for statically indeterminate structure is turned into an analysis of statically determinate structure.The internal force term yielded in the structure it is included in the computation formula of displacement.Here a new method is proposed.When the structure is only subjected to the action of temperature change or support translation.The computation formula of displacement is calculated directly for the statically indeterminate structure and does not include the internal force which is yielded in structure.The form of the computation formula of displacement is the same as that for the statically determinate structure.A new idea is suggested that when a statically indeterminate structure is subjected to the action of temperature change or support translation,the displacement of structure depends only on the state of temperature distribution or support translation,and is not related to internal force.This paper also discus ses,the displacement calculation when the statically indeterminate structure just reaches the limit load.